[Part 2]- C1- atomic structure ⚛️
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Fill in the gaps: Atoms are very small and have a radius of _ x __^-__ m [Remember: this is about the current model of an atom!]
• Fill in the gaps: Atoms are very small and have a radius of 1 x 10^-10m. • [also known as 0.1 nm]
Do atoms have an overall electrical charge? Explain your answer
• No, atoms don’t have an overall electrical charge • This is because the number of electrons, is the same number of protons.
• Fill in the gaps: The radius of a nucleus is less than 1/_, ___ of the radius of an atom. • Most of the atom is concentrated in the _______. • Hint: the current model of the atom
• The radius of a nucleus is less than 1/10, 000 of the radius of an atom. • Most of the atom is concentrated in the nucleus.
[Easy] What is the relative mass and relative charge of a proton?
Relative mass: 1 Relative charge: +1
[Easy] What’s the relative mass and relative charge of a neutron? Hint: charge is neutral
Relative mass: 1 Relative charge: 0
[Easy] What’s the relative mass and relative charge of an electron?
Relative mass: very small/0 Relative charge: -1
How do we work out the mass number of an element and the atomic number of an element?
• Think M, for massive. Look for the biggest number in that individual element [of the periodic table] • atomic number [number of protons]- look at the smallest number
RECAP: What’s an isotope?
Isotopes are: atoms of the same element, with a different number of neutrons.
What’s an ion?
• An ion is an atom, that has an overall charge. They have lost or gained electrons. • Positive ions= lost electrons • negative ions= gained electrons.
Fill in the gaps: In an atom, the number of electrons is equal to= the number of _______ in the nucleus.
In an atom, the number of electrons is equal to= the number protons in the nucleus.
What is the number of protons in an atom, of an element called?
Answer: atomic number.
What does the term ‘relative atomic mass’ mean?
• relative atomic mass is always the biggest number on the periodic table (when we look at an element). We don’t have to calculate anything. Think m, for massive. • [the relative atomic mass, is the average of the mass numbers, of the different isotopes]
What’s the equation for calculating the relative atomic mass, based on mass number and percentage abundance [of an isotope] ? Hint: not atom
Ar= (mass number of isotope 1 ✖️percent abundance of isotope 1) + (mass number of isotope 2 ✖️percentage abundance of isotope 2) ________________________________ 100
How many electrons can the first energy level hold?
• the first energy level can hold: 2 electrons
How many electrons can the second energy level hold?
• the second energy level can hold: 8 electrons
How many electrons can the third energy level hold?
• the third energy level can hold: 8 electrons
How can many electrons can the fourth energy level hold? Hint: ?> 12
• the fourth energy level can hold 18 electrons